:root{
    --bg:#f6f8fa; --panel:#ffffff; --ink:#151b23; --muted:#5a6572; --line:#e6e9ee;
    --brand:#2f6bff; --brand-dark:#1f4fd6; --brand-soft:#eef4ff;
    --green:#12945a; --green-soft:#e2f6ec; --amber:#c47d09; --amber-soft:#fdf3dc;
    --red:#d63030; --red-soft:#fdeaea; --ink-code:#0d1526;
  }
  *{box-sizing:border-box;margin:0;padding:0}
  html{scroll-behavior:smooth}
  body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
    background:var(--bg);color:var(--ink);line-height:1.6;-webkit-font-smoothing:antialiased}
  a{color:var(--brand);text-decoration:none}
  .wrap{max-width:1200px;margin:0 auto;padding:0 20px}
  /* header & nav */
  header{background:var(--panel);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:30}
  .nav{display:flex;align-items:center;justify-content:space-between;height:60px;position:relative}
  .logo{font-weight:800;font-size:19px;letter-spacing:-.4px;color:var(--ink)}
  .logo b{color:var(--brand)}
  .nav-links{display:flex;align-items:center;gap:4px;font-size:14px}
  .nav-link{display:inline-flex;align-items:center;gap:5px;color:var(--muted);font-weight:600;
    padding:9px 13px;border-radius:9px;cursor:pointer;background:none;border:none;
    font-family:inherit;font-size:14px;letter-spacing:-.1px}
  .nav-link:hover{color:var(--brand);background:var(--brand-soft)}
  .nav-soon{display:inline-flex;align-items:center;gap:6px;color:#9aa4b2;font-weight:600;
    padding:9px 13px;font-size:14px;cursor:default}
  .nav-soon .badge{font-size:10px;font-weight:700;color:var(--amber);background:var(--amber-soft);
    padding:2px 7px;border-radius:999px}
  /* All Tools dropdown */
  .nav-item{position:relative}
  .dropdown{position:absolute;top:100%;left:0;min-width:300px;background:var(--panel);
    border:1px solid var(--line);border-radius:14px;box-shadow:0 18px 40px rgba(20,30,60,.14);
    padding:8px;margin-top:10px;opacity:0;visibility:hidden;transform:translateY(-6px);
    transition:all .16s ease;z-index:40}
  .nav-item:hover .dropdown,.nav-item.open .dropdown{opacity:1;visibility:visible;transform:translateY(0)}
  .dropdown::before{content:"";position:absolute;top:-8px;left:26px;width:14px;height:14px;
    background:var(--panel);border-left:1px solid var(--line);border-top:1px solid var(--line);transform:rotate(45deg)}
  .drop-item{display:flex;align-items:center;gap:12px;padding:10px 12px;border-radius:10px;color:var(--ink)}
  a.drop-item:hover{background:var(--brand-soft)}
  .drop-item .ic{font-size:22px;flex:0 0 auto}
  .di-txt{flex:1;min-width:0}
  .di-txt b{display:block;font-size:14px}
  .di-txt small{display:block;font-size:12px;color:var(--muted);margin-top:1px}
  .drop-item.current{background:var(--brand-soft);outline:1px solid var(--brand)}
  .drop-soon{font-size:10px;font-weight:700;color:var(--amber);background:var(--amber-soft);
    padding:2px 7px;border-radius:999px;flex:0 0 auto}
  .foot-logo{color:var(--ink);font-weight:800;font-size:17px;letter-spacing:-.4px}
  .foot-logo b{color:var(--brand)}
  /* hero */
  .hero{text-align:center;padding:46px 0 20px}
  .hero .tagline{display:inline-block;font-size:12.5px;font-weight:700;color:var(--brand);
    background:var(--brand-soft);padding:5px 14px;border-radius:999px;margin-bottom:16px;letter-spacing:.2px}
  .hero h1{font-size:34px;line-height:1.2;letter-spacing:-.8px;margin-bottom:12px}
  .hero h1 span{color:var(--brand)}
  .hero p{font-size:17px;color:var(--muted);max-width:640px;margin:0 auto}
  @media(max-width:640px){.hero h1{font-size:26px}}
  /* calculator */
  .calc{background:var(--panel);border:1px solid var(--line);border-radius:18px;
    box-shadow:0 6px 24px rgba(20,30,60,.06);margin:26px 0;overflow:hidden}
  .calc-head{padding:18px 24px;border-bottom:1px solid var(--line);display:flex;
    align-items:center;justify-content:space-between;flex-wrap:wrap;gap:12px}
  .calc-head h2{font-size:17px}
  .templates{display:flex;gap:8px;flex-wrap:wrap}
  .tmpl{font-size:12.5px;font-weight:600;padding:7px 13px;border-radius:9px;border:1px solid var(--line);
    background:#fff;color:var(--muted);cursor:pointer;transition:all .15s}
  .tmpl:hover{border-color:var(--brand);color:var(--brand)}
  .tmpl.active{background:var(--brand);border-color:var(--brand);color:#fff}
  .calc-body{display:grid;grid-template-columns:1fr 1fr;gap:0}
  @media(max-width:760px){.calc-body{grid-template-columns:1fr}}
  .inputs{padding:22px 24px;border-right:1px solid var(--line)}
  @media(max-width:760px){.inputs{border-right:none;border-bottom:1px solid var(--line)}}
  .field{margin-bottom:15px}
  .field:last-child{margin-bottom:0}
  label{display:block;font-size:13px;color:var(--ink);margin-bottom:5px;font-weight:600}
  label .hint{font-weight:400;color:var(--muted);font-size:12px}
  .in-wrap{position:relative}
  .in-wrap .unit{position:absolute;right:12px;top:50%;transform:translateY(-50%);color:var(--muted);font-size:13px}
  input[type=number]{width:100%;padding:10px 12px;border:1px solid var(--line);border-radius:9px;
    font-size:15px;color:var(--ink);background:#fff;font-variant-numeric:tabular-nums}
  input:focus{outline:none;border-color:var(--brand);box-shadow:0 0 0 3px var(--brand-soft)}
  .tmpl-note{font-size:12px;color:var(--muted);background:var(--brand-soft);border-radius:8px;
    padding:8px 11px;margin-bottom:15px;line-height:1.5}
  .adv-toggle{font-size:12.5px;color:var(--brand);cursor:pointer;font-weight:600;user-select:none;margin-top:4px}
  .adv{display:none;margin-top:14px;padding-top:14px;border-top:1px dashed var(--line)}
  .adv.open{display:block}
  /* outputs */
  .outputs{padding:22px 24px;background:#fbfcfe}
  .verdict{border-radius:12px;padding:15px 16px;margin-bottom:16px;font-weight:700;font-size:15px;line-height:1.45}
  .v-low{background:var(--green-soft);color:var(--green)}
  .v-mid{background:var(--amber-soft);color:var(--amber)}
  .v-high{background:var(--red-soft);color:var(--red)}
  .metrics{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-bottom:16px}
  .metric{background:#fff;border:1px solid var(--line);border-radius:11px;padding:12px 13px}
  .metric .k{font-size:12px;color:var(--muted);margin-bottom:3px}
  .metric .v{font-size:19px;font-weight:800;font-variant-numeric:tabular-nums;letter-spacing:-.3px}
  .metric .v small{font-size:12px;font-weight:600;color:var(--muted)}
  .action{background:var(--ink-code);color:#e8eefb;border-radius:12px;padding:15px 16px}
  .action .h{font-size:12px;text-transform:uppercase;letter-spacing:.6px;color:#8fa6d6;font-weight:700;margin-bottom:6px}
  .action .big{font-size:16px;font-weight:700;line-height:1.45}
  .action .big em{color:#7dd3fc;font-style:normal}
  .action .why{font-size:12.5px;color:#aebbd6;margin-top:6px}
  /* sections */
  section{margin:42px 0}
  h2.sec{font-size:23px;letter-spacing:-.4px;margin-bottom:6px;text-align:center}
  .sec-sub{text-align:center;color:var(--muted);font-size:15px;margin-bottom:22px}
  /* tool cluster */
  .cluster{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
  @media(max-width:760px){.cluster{grid-template-columns:1fr 1fr}}
  @media(max-width:480px){.cluster{grid-template-columns:1fr}}
  .tool-card{background:var(--panel);border:1px solid var(--line);border-radius:13px;padding:18px;
    transition:all .15s;display:block}
  .tool-card:hover{border-color:var(--brand);box-shadow:0 4px 14px rgba(20,30,60,.07);transform:translateY(-2px)}
  .tool-card .ic{font-size:22px;margin-bottom:8px}
  .tool-card h3{font-size:15px;color:var(--ink);margin-bottom:3px}
  .tool-card p{font-size:13px;color:var(--muted)}
  .tool-card .soon{font-size:11px;font-weight:700;color:var(--amber);background:var(--amber-soft);
    padding:2px 8px;border-radius:999px;display:inline-block;margin-top:8px}
  .tool-card.live .soon{color:var(--green);background:var(--green-soft)}
  /* content */
  .prose{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:26px 28px}
  .prose h3{font-size:17px;margin:20px 0 8px}.prose h3:first-child{margin-top:0}
  .prose p{color:var(--muted);margin:8px 0}
  .prose ul{margin:8px 0 8px 20px}.prose li{color:var(--muted);margin:6px 0}
  .prose b{color:var(--ink)}
  .steps{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin:6px 0}
  @media(max-width:640px){.steps{grid-template-columns:1fr 1fr}}
  .step{background:var(--brand-soft);border-radius:11px;padding:14px;text-align:center}
  .step .n{font-weight:800;color:var(--brand);font-size:18px}
  .step .t{font-size:13px;color:var(--ink);font-weight:600;margin-top:4px}
  /* faq */
  details{background:var(--panel);border:1px solid var(--line);border-radius:11px;padding:0;margin:10px 0}
  summary{padding:15px 18px;font-weight:600;font-size:15px;cursor:pointer;list-style:none;position:relative}
  summary::-webkit-details-marker{display:none}
  summary::after{content:"+";position:absolute;right:18px;color:var(--brand);font-weight:700;font-size:18px}
  details[open] summary::after{content:"–"}
  details .ans{padding:0 18px 15px;color:var(--muted);font-size:14px}
  /* footer */
  footer{background:var(--panel);border-top:1px solid var(--line);margin-top:50px;padding:30px 0}
  .foot-grid{display:flex;justify-content:space-between;flex-wrap:wrap;gap:20px}
  .foot-brand{font-weight:800;font-size:17px}.foot-brand b{color:var(--brand)}
  .foot-brand p{font-size:13px;color:var(--muted);margin-top:6px;max-width:280px}
  .foot-col h4{font-size:12px;text-transform:uppercase;letter-spacing:.5px;color:var(--muted);margin-bottom:10px}
  .foot-col a{display:block;font-size:13.5px;color:var(--ink);margin:6px 0}
  .foot-col a:hover{color:var(--brand)}
  .copyright{text-align:center;font-size:12.5px;color:#9aa4b2;margin-top:24px;padding-top:18px;border-top:1px solid var(--line)}
  /* mobile nav */
  .nav-toggle{display:none;background:none;border:none;font-size:24px;line-height:1;color:var(--ink);cursor:pointer;padding:6px 8px}
  @media(max-width:640px){
    .nav-toggle{display:block}
    .nav-links{display:none;position:absolute;top:60px;left:0;right:0;background:var(--panel);
      flex-direction:column;gap:0;padding:6px 14px 14px;border-bottom:1px solid var(--line);
      box-shadow:0 10px 24px rgba(20,30,60,.1);align-items:stretch}
    .nav-links.open{display:flex}
    .nav-link,.nav-soon{width:100%;text-align:left;padding:13px 8px;font-size:15px;border-radius:0}
    .nav-soon{border-bottom:1px solid var(--line)}
    .nav-item{position:static}
    .dropdown{position:static;opacity:1;visibility:visible;transform:none;box-shadow:none;
      border:none;margin:0;padding:0 0 6px 10px;min-width:auto;display:none}
    .nav-item.open .dropdown{display:block}
    .dropdown::before{display:none}
  }
  /* worked-example table */
  table.ex{width:100%;border-collapse:collapse;margin:12px 0;font-size:14px}
  table.ex th,table.ex td{border:1px solid var(--line);padding:9px 12px;text-align:left;vertical-align:top}
  table.ex th{background:var(--brand-soft);color:var(--brand-dark);font-size:13px}
  table.ex td:last-child{font-weight:700;color:var(--ink);font-variant-numeric:tabular-nums}
  /* footer placeholder (no destination yet) */
  .foot-col span.foot-ph{display:block;font-size:13.5px;color:#9aa4b2;margin:6px 0;cursor:default}

  /* small screens: let tables scroll horizontally instead of overflowing */
  .tbl-scroll{overflow-x:auto;-webkit-overflow-scrolling:touch;max-width:100%}
  .calc-body>div{min-width:0}
  .layout>*{min-width:0}
  .tbl-scroll>table{margin-top:0;margin-bottom:0}
  .tbl-scroll{margin:12px 0}

  /* ===================== BLOG FRONTEND ===================== */
  .blog-wrap{max-width:1200px;margin:32px auto;padding:0 20px;display:flex;gap:32px;align-items:flex-start}
  .blog-content{flex:1;min-width:0}
  .blog-sidebar{width:300px;flex:0 0 300px;position:sticky;top:80px}
  .blog-content h1{font-size:2rem;letter-spacing:-.6px;margin-bottom:14px}
  .side-box{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:18px;margin-bottom:18px}
  .side-box h3{font-size:12px;text-transform:uppercase;letter-spacing:.6px;color:var(--muted);margin-bottom:12px}
  .search-form{display:flex;gap:8px}
  .search-form input{flex:1;min-width:0;padding:9px 12px;border:1px solid var(--line);border-radius:8px;font-size:14px;font-family:inherit;background:#fff}
  .search-form .btn{padding:9px 14px;font-size:14px}
  .side-note{font-size:12.5px;color:var(--muted);margin-top:10px}
  .side-note a{color:var(--brand)}
  .cat-list{list-style:none;display:flex;flex-direction:column;gap:2px}
  .cat-list a{display:block;padding:7px 10px;border-radius:8px;color:var(--ink);font-size:14px}
  .cat-list a:hover{background:var(--brand-soft);color:var(--brand)}
  .cat-list a.active{background:var(--brand);color:#fff}
  .post-list article{border-bottom:1px solid var(--line);padding:22px 0}
  .post-list h2{font-size:1.4rem;margin-bottom:6px;line-height:1.3}
  .post-list h2 a{color:var(--ink)}
  .post-meta{color:var(--muted);font-size:.85rem;margin-bottom:8px}
  .post-excerpt{color:var(--muted)}
  .backlink{margin:0 0 18px;font-size:14px;font-weight:600}
  .backlink a{color:var(--muted)}
  .backlink a:hover{color:var(--brand)}
  .empty{padding:60px 0;text-align:center;color:var(--muted)}
  /* pagination */
  .pager{display:flex;justify-content:center;align-items:center;gap:6px;margin:30px 0 10px;flex-wrap:wrap}
  .pager a,.pager span{display:inline-flex;align-items:center;justify-content:center;min-width:36px;height:36px;padding:0 10px;border:1px solid var(--line);border-radius:8px;font-size:14px;color:var(--ink);background:#fff}
  .pager a:hover{border-color:var(--brand);color:var(--brand)}
  .pager .current{background:var(--brand);border-color:var(--brand);color:#fff}
  .pager .dots{border:none;background:none}
  @media(max-width:860px){
    .blog-wrap{flex-direction:column}
    .blog-sidebar{width:100%;flex:none;position:static}
  }

  /* ===================== BLOG ADMIN CHROME ===================== */
  .admin-bar{background:var(--ink);color:#fff;position:sticky;top:0;z-index:30}
  .admin-bar-inner{display:flex;align-items:center;justify-content:space-between;height:56px}
  .admin-brand{color:#fff;font-weight:800;font-size:17px;text-decoration:none;letter-spacing:-.4px}
  .admin-brand b{color:var(--brand)}
  .admin-brand span{font-weight:500;color:#9fb0c9;font-size:13px;margin-left:6px}
  .admin-nav{display:flex;gap:4px;flex-wrap:wrap}
  .admin-nav a{color:#cdd7e6;font-size:14px;font-weight:600;padding:8px 14px;border-radius:8px;text-decoration:none}
  .admin-nav a:hover{background:rgba(255,255,255,.08);color:#fff}
  .admin-nav a.active{background:var(--brand);color:#fff}
  .admin-foot{padding:24px 0;color:#9aa4b2;font-size:13px;text-align:center;margin-top:40px}
  .dash{max-width:1200px;margin:32px auto;padding:0 20px}
  .ed{max-width:1000px;margin:28px auto;padding:0 20px}
  .search-row{display:flex;gap:10px;margin:18px 0}
  .search-row input{flex:1;min-width:0;padding:10px 12px;border:1px solid var(--line);border-radius:8px;font-size:14px;font-family:inherit;background:#fff}